Headphone



FIG. 1 is a perspective view of a headphone showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The mirror image of the interior ear cup forms no part of the claimed design. 

The ornamental design for a headphone, as shown and described. 